feat(alerts): Column for select tabs to send

[m-ajay]

As of now, users can only send the first tab of the dashboard. We are improving the feature, to let the user select the tabs to send. Please see the discussion here #14056 .

This PR adds a new column to Report schedule, initially this will be used to store the IDs of the tabs to send.

SUMMARY

Second PR will include letting users select the tabs of the dashboards to send.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[graceguo-supercat]

@m-ajay Thanks for the work!
Currently, we want to enrich the email report feature with dashboard tab selection. But in the very near future, we might want to enrich the report with filter set selection, or dashboard_owners etc. So i think all these extra configuration for a report, could be stored in the same column that you will add today.

So how about name this column as extra_config, column type Text is good, and will populate an empty json {} text as default data?

[dpgaspar]

@m-ajay can you please update the PR description and fix CI, seems like a mig issue

[codecov]

Codecov Report

Merging #17604 (b45db18) into master (c6ba9bf) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #17604      +/-   ##
==========================================
+ Coverage   68.48%   68.55%   +0.06%     
==========================================
  Files        1601     1601              
  Lines       65268    65273       +5     
  Branches     6966     6966              
==========================================
+ Hits        44698    44747      +49     
+ Misses      18680    18636      -44     
  Partials     1890     1890              

Flag	Coverage Δ
hive	81.38% <100.00%> (+<0.01%)	⬆️
mysql	81.80% <100.00%> (+<0.01%)	⬆️
postgres	81.81% <100.00%> (+<0.01%)	⬆️
presto	81.68% <100.00%> (?)
python	82.30% <100.00%> (+0.15%)	⬆️
sqlite	81.49% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/models/alerts.py	97.33% <ø> (ø)
superset/models/reports.py	100.00% <100.00%> (ø)
superset/charts/schemas.py	99.33% <0.00%> (+<0.01%)	⬆️
superset/datasets/schemas.py	96.61% <0.00%> (+0.08%)	⬆️
superset/models/core.py	90.00% <0.00%> (+0.73%)	⬆️
superset/connectors/sqla/models.py	88.42% <0.00%> (+1.34%)	⬆️
superset/db_engine_specs/presto.py	90.39% <0.00%> (+6.05%)	⬆️

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[etr2460]

should we use extra for the column name instead of extra_config, to be consistent with other tables in superset?

[graceguo-supercat]

LGTM